Tension for paper rolls



May 22, 1934, g LZE 1,959,445

TENSION FOR PAPER ROLLS Filed Sept 18, 1926 F217. 1 F15 L.

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Patented May 22, 1934 UNITED STATES PATENT OFFICE 1,959,445 TENSION FOR PAPER ROLLS Gottfried Salzcr, West Hartford, Conn., assignor to R. Hoe & 00., Inc., New York, N. Y., a- Corporation of New York; Irving Trust Company, receiver Application September 18, 1926, Serial No. 136,263

l Claims.

on the rolls, and the object of my improvement is to produce a tension for paper rolls that provides a substantially uniform tension for the paper as it is delivered from the rolls and as the size of the roll is continuously reduced as the paper is wound off down to the stump; that provides a plurality of belts or bands that bear against the paper for providing the friction contact; that operates to check the rollagainst unwinding in the case of stopping of the press, and; that permits of free operation in replacing a stump by a new roll, substantially without obstruction or interference by the devices involved in providing the tension.

In the accompanying drawing:-

Figure 1 is a rear elevation, as viewed from the end of the press of a paper rack with a roll equipped with a tension device embodying my invention.

Figure 2 is a front elevation of the same, as viewed from inside the press.

Figure 3 is an end elevation of the same.

Figure 4 is a fragmentary view of the other end.

Figure 5 is a fragmentary plan View on an enlarged scale of the fixed end portion of one of the friction band or belt structures.

My improved tension for paper rolls operates to provide a frictional resistance to the roll 10 of paper that is used to supply paper for printing presses and the medium for providing such resistance comprises a flexible friction device which is wound up on a drum or spool as the roll decreasesin size, this friction device as shown including a plurality of bands or belts 11 that bear against the periphery 12 of said roll 10.

The roll 10 is of the usual form having an axial core that is supported by means of end bearings 13 that are provided on the side frames 14. I

As shown, the bands 11 bear against the p eriphery 12 on the inner side 15 of the roll 10 and the roll end 16 runs off from the top side 17, the direction of the rotation of the roll 10, as shown in Fig. 1, being counter-clockwise.

.The upper end of the band 11 in each case. is connected to a fixed support 18, which, as shown, is in the form of a bar that extends across between the two side frames 1% and which is close to the top side 17 of the roll 10 whenin the full-sized condition. As the paper is unwound from the roll 10 and the diameter decreases the spacing of the bar 18 from the paper increases and by the time that only the stump remains there is an appreciable change in the spacing of the bar 18 from the periphery of the paper roll and there is a corresponding decrease in the diameter of the periphery 12 on the inner side 15 6 along which the bands 11 make the frictional holding contact.

Thus, as the weight of the paper on the roll 10 decreases there is a compensating reduction in the frictional holding effect of the bands 11.

I find it desirable to make further provision for reducing the frictional holding effect to com pensate for the reduction in the size of the roll 10 and I do this by operating upon the lower end portions 19 of the bands 11.

Briefly, said lower end portions 19 are arranged to wind-up on individual spools or drums 20. The bands 11 are made of leather and of appreciable thickness and as the diameter of the paper roll 10 decreases more of the lower end portion 19 in each case is rolled-up and piled-up on the drum or spool 20 and the diameter of the band material on the spool is increased. Thus, as the frictional brake contact of the bands 11 is effected by means, to be described, that operate to rotate the spools 20, the tangential pull on the bands 11. and also the effective length of said bands are reduced automatically as the diameter of the paper roll 10 is decreased.

The bands 11 are-arranged to permit of shifting laterally to any desired position along the roll in any approved manner. The upper end portions are supported from the bar 18 so as to permit of such lateral shifting and the spools 20 to which the lower end portions '19 are connected are splined to their supporting shafts 21.

As shown, there are two bands 11 and there is a shaft 21 for each spool 20 and band 11. This arrangement provides for flexibility and for variations in the characteristics of different parts of the roll 10, such as flat spots and the like. In order to further provide flexibility I provide in the connection with the bar 18 a pair 'ofcoil springs'22- that are connected one to each of the corners 23 of the upper end portion 24 of the ma-' terial of the band 11. a

The shafts 21 are supported from a cross-brace 25 that interconnects the side frames 14 by means of bearings comprising the opposed inner bearings 26, one for each shaft 21, and the outer bearings 2'7. As the two bands 11 are always spread apart and separated one from the other by an appreciable space the opposed inner bear-' ings 26 are correspondingly spread apart.

The rotation of the spool supporting shafts 21 for effecting the frictional pressure on the roll 10 is effected, in the construction shown, by means of a weight in each case, there being a weight-drum 28 for each weight 29. The weightdrums 28 are individually mounted on an overhanging portion 30 of the shaft 21 that projects outwardly beyond the adjacent side frame 14. The weight 29 is supported by means of a cable 31 that unwinds as the weight drops responsive to the reduction of the diameter of the paper roll 10.

The spool supporting shafts 21 are located appreciably back from the axis of the paper roll 10. Instead of connecting the body portion 32 of the band 11 directly with the spool 20, I provide intermediate these parts a return bend 33 in the band 11 that passes over an idler 34 and thereby provides a relatively large surface extent for the opposed contacting portions of the periphery 12 and the body portion 32. Thus the angle for such contact for a full-sized roll will be appreciably more than 120 degrees. By this arrangement with a given pressure due to the weight 29 there is a minimum of pressure per unit area.

The arrangement of bands shown operates satisfactorily in relatively large presses. In some cases it may be desirable to provide more bands than the number shown.

I claim as my invention: 1. In a tension mechanism for paper rolls for printing presses, the combination of a flexible friction device arranged to engage the surface of the paper roll, a fixed support for one end of the friction device, a rotary member around which means for effecting the rotation of the member as the paper roll decreases in size, and a member the other end of the friction device is wound,

located at a point between the rotary member and the paper roll around which member the flexible friction device passes before it reaches the rotary member.

2. In a tension device for paper rolls for printing presses, a plurality of bands for contacting with the paper on the roll, a fixed support for one end of said bands, a separate tension means for the other end of each of said bands for effecting pressure of the bands on said roll, each of said tension means being provided with a separate means for adjusting the tension so that the tension of each of the bands widthwise of the roll may be adjusted independently of any other band.

3. In a tension device for paper rolls for printing presses, a plurality of spaced bands for contacting with the paper on the roll, a fixed support for one endof said bands, a separate rotary member for each of said bands around which the other ends of said bands are wound, and a separate tension device for each rotary member for effecting its rotation and for adjusting the tension of the bands so that the tension of each band widthwise of the roll may be adjusted independently of any other band.

4. In tension devices for paper rolls for printing presses, a band for contacting with the paper on the roll, a support for one end of the band, a spool connected to the other end of the band, means for rotating the spool to tension the band,

a return bend portion of said band intermediate the body portion of said band and said spool, and an idlerv supporting said bend, whereby contact of the band and paper roll is extended beyond the spool.

GO'ITFRIED SALZER. 

